Downloaded, installed easily. Tried to convert already downloaded kindle book. Failed with message Kindle reader not installed on PC. Downloaded and installed kindle reader (free) from amazon. Found a free kindle book to download to PC. Now added to Epubdor and pressed convert. Quick conversion to epub and outputted file reads fine. As a test tried to convert same file with Calibre (just in case free amazon books are DRM free) failed with cannot convert DRM protected message. Since I've already paid for my kindle books, personally quite happy to strip out the DRM protection so I can read them on my nook as well. A keeper - note to publishers I do not like 12 month licenses and steer clear of that type of software wherever possible.